The entire point of shadowbanning is making the fact that the user is banned non-obvious to that user--otherwise, they'd be liable to immediately create a new account and continue with the activity that warranted the ban in the first place.
Both "telling them why" and "not obfuscating the fact" would defeat the entire purpose of a shadowban (as opposed to a "traditional" ban).
Both "telling them why" and "not obfuscating the fact" would defeat the entire purpose of a shadowban (as opposed to a "traditional" ban).